Dynamo-electric machine.



No. 784,103. PATENTED MAR. '7, 1905. J. BURKE.

DYNAMC ELECTRIC MACHINE.

APPLIUATION FILED JULY 1a, 1904.

J AMES BURKE, OF NEIV YORK, N.

Patented March 7, 1905.

PATENT OFFICE.

Y., ASSIGNOR TO BURKE ELECTRIC COMPANY, A CORPORATION OF NEIV JERSEY.

DYNANlO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent NO. 784,103, dated March 7,1905.

l Application filed July 18, 1904. Serial No. 216,985.

To 0M wil/0m, it 11m/y con/cern:

v Be it known that I, JAMES BURKE, a citizen of the United States,residing at New York, in the county of New York and State ot` New York,have invented certain new and usei'ul Improvements in Dynamo-ElectricMachines, oi' which the followingfis a full, clear, and exactspecification.

This invention relates to dynamo-electric machines; and its object is toprovide a machine which shall be well ventilated, in which the variousparts shall befreadily accessible, in which a minimum of material willbe required, and which will be compact and small in size for a givenoutpu-t.

T he invention will be more fully described with reference to themachine illustrated in the accompanying drawings, in which* Figure l isan end elevation, partly in section and with certain parts removed. Fig.2 is a side elevation partly in4 section; and Fig. 3 is a planelevation, partly in section, looking from the bottom.

In the drawings the held-magnet trame is shown as an integralinvert-ed-U-shaped casting carrying' the lield-poles I I. The upperportion 2 of the magnet-'frame forms a magnetic path irorn pole to polein substantially the same manner as has heretofore been customary. Thelower portion 3 of the iieldmagnet is so arranged as to leave the undersurface ot' the armature substantially exposed through the bottom of themachine. As shown in the drawings, this may be done by making the lowerside portions which serve as bases also serve to carry the magneticflux, thus forming the large opening 4 in the bottom of the machine. Theends ot' the Held-frame are provided with the openings 5, the edges ofwhich may be adapted to receive and support brackets 6 6, in which maybe carried the ar mature-bearings. The openings 5 5 are preferablycircular, and the lower side portions 3 may be provided with enlargedportions 7, the cross-section of which increases in proportion to thedecrease in the cross-section of the side portion due to the openings 5.The relative proportions olE the portions 2 and 3 will be calculatedaccording to individual conditions, the aggregate cross-section of theparts being' made sufIicient to carry the desired magnetic flux.

Around the base ot' the poles I is 'Iormed an annular beveled portion 9in order that when the held-coils 8 are put in place an annularVentilating-space will be left between the coil and magnet-frame, thussecuringl ventilation of the coil. The beveled portion also serves todistribute the magnetic liuX Jfrom the pole to the yoke.

The poles may ot' course be solid or laminated and attached to thefield-frame in any suitable manner. I pret'er the construction shown inthe drawings, in which the pole is cast integral with the iield-i'rameand laminated pole-faces IO are bolted to the poles.

It will be noted that in the construction described the parts requiringventilationfesuch as armature, field-coils, &e.*are directly exposed tocurrents of air passing through the opening in the bottom ot' themachine.

The machine should be supported so as to allow a vfree How of airthrough the bottom, and in case the machine is to rest on a planesurface feet should be provided to raise thc machine somewhat. In thedrawings such feet are shown at the four corners.

The Ventilating air-currents have free access into the machine andthrough the same by reason o't' the bottom and end openings,a strongcirculation of air being .established through the same. Moreover, inbuilding and repairing the machine all of the parts are accessiblethrough the bottom opening, which enables the parts to be machined atless cost and to be more readily assembled. At the same time thefield-magnet construction as a whole is easily cast and machined andutilizes to the fullest extent the metal in a given machine.

It will be understood that the construction above described may bemodified in various respects without departing from the invention, and Itherefore desire it to be understood that I do not herein lirrrit myselfto the specilic construction showni' Having thus described my invention,I declare that what I claim as new, and desire to secure by LettersPatent, is

l. In a dynamo-electric machine, a frame having a central openingthrough its bottom portion, the said opening communicating directly withthe space between the field-poles and affording' free access to saidpoles and the coils thereon, said field-poles projecting radiallyinward.

2. A field-magnet frame for dynamo-electric machines provided withopenings in the bottom and end portions, the aggregate cross-section ofthe frame tl'iroughout being substantially equal to the cross-section ofthe poles.

3. A field-magnet frame for dynamo-electric machines, the base of whichcomprises two paths, each adapted to carry the magnetic flux, andseparated from each other to form an opening in the bottom of themachine, substantially as described.

4. A field-magnet frame comprising a housing having an opening at itsbottom, said opening being' formed within side portions which areadapted to carry the magnetic iux, and said frame having' poles whichproject radially inward` substantially as described.

5. A dynamo-electric machine having a nshaped field-frame and having anopening' through the bottom, said field-frame encompassingboth thelield-poles and the coils thereon, substantially as described.

6. A dynamo-electric machine having' a nshaped held-magnet open at thebottom, and side connections for the ends of said magnet adapted tocarry the lnagnetic flux, substantially as described.

7. ,In adynamo-electric machine, the combination of aninve1'ted-U-sliaped integral fieldframe having side portions connecting'the four corners, and side brackets for supporting the armature,substantially as described.

8. ln a dynamo-electric machine, a frame Y having Ventilating-openingsthrough the ends thereof and a vcntilating-opening through its bottomportion, the said opening at the bottom communicating directly with thespace between the field-poles, the said field-poles projecting radiallyinward from said frame, and iield-coils carried by said poles.

9. In a dynamo-electric machine, a frame having ventilating-openingsthrough the ends vis/m03 thereof and a Ventilating-opening through thecenter of its bottom portion, the said opening1 at the bottomcommunicating directly with the space between the field-poles, the saidfieldpoles projecting radially inward from said frame, and field-coilscarried by said poles.

l0. In a dynamo-electric machine, a iframe having Ventilating-openingsthrough the ends thereof, and a ventilating-opening through its bottomportion, the said opening at the bottom communicating directly with thespace between the field-poles, the said iield-poles projecting radiallyinward from said frame, and the bottom portion of said frame serving toconduct magnetism from pole to pole.

11. In a dynamo-electric machine, a frame having Ventilating-openingsthrough the ends thereof and a Ventilating-opening through its bottomportion, the said opening at the bottom being formed by side portions onsaid frame, said side portions serving to conduct magnetism from pole topole, and the said poles projecting radially inward.

l2. In a dynamo-electric machine, a frame having an opening through itsbottom portion, the said opening communicating directly with the spacebetween. the field-poles, said iield poles projecting radially inwardand said opening being formed within side portions of said frame, saidside portions serving to conduct magnetism from pole to pole.

13. In a dynamo-electric machine, a frame having a central openingthrough its bottom portion, the said opening communicating directly withthe space between thc held-poles, said field-poles projecting radiallyinward and said opening being formed within side portions of said frame.

14. In a dynamo-electric machine, the combination of an armature and aheld-magnet frame, said frame having circiinnfcrential and end openingsand poles which project radially inward, and field-'coils carried bysaid poles, said circumferential opening communicating directly with thespace between said poles.

In testimony whereof I aflix my signature in presence of two witnesses.

JAMES BURKE. W itncsses:

JOHN ArriiuN, L. R. SAeEr..

